Back-pedaling change-speed gear applicable to bicycles.



L. VEYRET. BACK PEDALING CHANGE SPEED GEAR APPLICABLE T0 BICYCLES.

APBLICAON FILED 0CT.22 |911.

Patented Allg. 13, 1918.

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L. VEYRET.

-BACK PEDALING CHANGE SPEED GEAR APPLICABLE AT0 BICYGLE'S.v

APPLICATION msn 0111.22, 1911.

1,275,505. Patented Aug. 13, 1918.

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UNITED, STATES Partnersites. e

- LOUIS VEYRET, or raars,-V FRANCE.

BAcK-,PEDALING CHANGE-SPEED ema APPLICABLE@ BIcYcLns To all whom it may concern.I

Be it known' that I, LOUIS VEYRET, re-k siding! at Paris, France,.hav'e invented new and' useful; Back-Pedaling Change-Speed Gea-r Applicable to Bicycles, of which the following is a specification.

. This *invention relates .to a mechanism which enables a shaft which can rotate in both directions, to transmit a movement always having the same direction, toanother shaft orV pinion, the movement in one direction: transmitting however a greater speed to the driven shaft than the movement in the opposite direction.;y f f .In the accompanying drawing given merely by way of example,`

Y Figure 1 is a diagrammatic view ofthe:

gear in axial section; Y f

F1g..2 s a front elevation corresponding 'to Fig. 1; f

Fig.' Sis a front velevation showingapplication of the gear yto the crank mechanism of a bicycle;l

Fig..4 is a view, half in a'Xial section and'v halfinelevation, corresponding to Fig. A3; Fig 5V. is aview, half in axial section and half in elevation, the gear to the hub bicycle, and y Fig. 6 is a front elevation corresponding to Fig. 5, a disk being supposed'to have been removed on the left hand half of the figure soas to show the mechanism.. v f

In the diagrammatic Figs. l and 2,:the driving shaft 1 has two ratchet gears 2 and of a driving wheel of a 3 which act in opposite directions. The

pinion 4 is that which is to be driven, and it is in engagement with the ratchet gear 2; a disk 5 carries the spindles 6 of the auxiliary satellite pinions 7 engaging with a central pinion 8 which is in engagement with the ratchet gear 3.

When the shaft 1 is moved in the direction of the arrow f which in a bicycle indicates the usual direction of forward traveling, the ratchet gear 2 drives direct the pinion 4 which, by means of a chain or other gear, propels the driving wheel in the forward direction. The pinion 4 transmits to the satellite pinions 7 a movement of rotation which they transmit to the central pinion 8 which rotates loosely on the ratchet gear 3 in the direction opposite to that of the shaft 1, without producing any effect.

If the spindle 1 is rotated in the opposite direction by back-pedalng, in the event showing application of' Specification of Letteis Patent. 'Patented Atag. 13,1918'. Application filed October 22, 1917'. Serial No. 197,892.`

-In casev of the application of the gear tol the crank mechanism of `a bicycle, the shaft 1 will be the shaft carrying the pedals Y9 and rotating in the interiorof the cylindrical casing 10 of the crank mechanism, as usual. The; ratchet gear 2 is mounted on a square p'o'rtijon 11 lof the shaft 1, vand the v back-pedaling ratchet gear' is keyed to the same shaft 1. The cones of the ball bearings of the said yshaft 1Y form part of a to drive the pinion 4, l

cylindrical tubev 12 keyed to the same means of a projection 13 '(Fig. 4); as regardsth'e cups, they are screwed in the usual manner at the ends of the crank mechanism, as clearly shown .in the drawing.v Adjust-. menit ,is effected by means of a nut 14 screwed on the shaft 1 at the left hand side, ofthe crankmechanism and capable of be;Y ing locked on the same by means of a screw,

of .mounting not shown. This method makes it possible to remove thefcrank shaft..

and the whole mechanism on removing the left hand pedal and the nut k14,-vvithout dis:

. turbing the ball bearings of the crank shaft,

since the cylinder 12 remains in place.

The ratchet gear 3 can be uncovered by removing the right hand pedal, a nut 15 screwed on the shaft 1 between the said pedal and the ratchet gear 2, and by removing also the ratchet Wheel 2 which drives the disk 5, the central part of, which comprises two halves suitably connected so as to inclose the ratchet Wheel'2 and to contain the pawls 16, the spindles of which are formed by the screws 17 which connect together the two halves of the Ydisk 5.

The elements of the gear are marked with the same reference numbers as in Figs. 1 and 2, and it is unnecessary to describe them.

The principal pinion 4 which is provided with inner teeth and secured to the disk 5, carries the toothed wheel 18 on Which is wound the chainpassing on the other hand over the hub of the driving wheel in order to transmit toit a movement of rotationv In the construction shown in Figs. 5 and 6 relating to the application of the gear to the hub of a driving wheel of a bicycle, the driving shaft l, like in the previous case, is arranged in' the axis of the casing l() ofthe hub, but it is stationary, and about it can rotate a cylindrical socket 19 which carries the ratchet wheels 2 and 3 acting in opposite directions, as already explained. The hub 10 can rotate about the socket 19 by means of ball bearings 2O and 21, and the socket 19 itself rotates about the shaft I by means ofl ball bearings 22 and 23. The disk 5 is preferably provided with ribs in order to strengthen it, and screwed on the shaft l; it carries by means of pins 6 and ball bearings, the satellite pinions 7 which engage with the central pinion 8 engaging with the ratchet wheel 3 and a ring L with inner teet-h secured to the hub 10. In the interior of the said hub', facing the ratchet wheel 2, is secured a ring 24, to the interior of which areI secured the pawls which act on the said ratchet wheel. lIhe chain pinion 26 is secured to one end of the socket19.

'Ihc same reference numbers indicate intentionally in this construction the partsy corresponding to those oi Figs. l and 2, and the working is identical with that described; that is to say that, when the pinion 26 is rotated in the direction of normal pedaling, the ratchet wheel 2 drives direct the hub 10; in the event of back pedaling, it will be the ratchet wheel 3 which, by means of the central pinion drive the toothed ring land therefore the hub l0 in the same direction as before, but

' at a reduced speed.

The fitting and dismantling of the ele-y ments arranged as just described are excopie o: this patent may be obtained for 8 and satellite pinions 7, willtremely easy, as well as the adjustment of the( bearings.

In thel constructions shown in Figs. 3-6

of the drawing, it Vhas been assumed that there were four satellite pinions 7, but it is i obvious that the number in question could be increased or reduced according to the dimensions of the gear and to the applications; in the same way, in Fig. 3, the pawls 25 controlled by return springs, have the shape of 1 In a change speed gear for a bicycle of the character described, the combination of al driving shaft with two ratchet gears acting in opposite directions, apinion adapted to be driven by one of said ratchets in the direction of pedaling,'other pinions to which the rotation of said pinion is transmitted and a central pinion rotating loosely on thel second of said ratchet-gears in a direction opposite to that of said shaft, andadapted to transmit rotation to thev rst named pinion inthe direction of mot-ion with al speed reduced at the same ratio as the differencebetween the radii of the first and second named pinions, substantially as described. In testimony whereof I aiiiX my signature in presence of two witnesses.

LOUIS VEYRET. Witnesses:

ABEL JLmN, JULES LEBREUX.

ve cents cach, by addressing the commissioner of Patents.

Washingtoml). W 

